Over thinking loop classification can drive you crazy but FWIW, I will share my own view...
The first thing is that these loops are all about ball quality and about producing a certain kind of ball. IMO, some people like to teach every stroke as if it requires a separate technique. To me, all loops are the same with adjustments. The adjustments tend to be based on the incoming ball and the kind of outgoing ball you want to produce. The adjustments are based on things like contact point, starting position, finishing position, speed of swing and thickness/thinness of contact, size of the stroke/whip, degree of curve in the stroke and the degree to which the racket face is offered to the ball. With that, all strokes should have whip.
When you have your whippy swing, then you can adjust it using the above to control different kinds of incoming balls and hit different kinds of outgoing balls. But consistency should be the focus in matches. In practice, understanding and acquiring variety should be the focus in addition to consistency - consistency to make the mechanics embedded in muscle memory and acquiring variety so you can spontaneously make the ball do what you want very quickly. Too many people hit the ball one way in practice and put the ball on the table all the time, it doesn't let you understand your stroke and what it does to the ball. IT doesn't let you know how to increase the consistency or even the arc or how to be more conservative or more directly aggressive or doesn't let you see how your stroke can be improved under pressure or how to adjust to spins you have not played against yet.
MY approach to looping is based on feeling I am controlling the ball, its more important than thinking you are just hitting the ball past people. I always try to compare the ball I produce to the ball I intended to produce. It's the only way to develop a good stroke discipline. Putting the ball on the table 100 times is VERY important, but doing so without understanding what changes when you change will hurt you in matches as you need to adapt to balls you have never seen before.
For me, there is the 50-80% loop - this is the loop you should be trying to make as good as possible, it is the loop around which you can build your footwork etc. You can hit it for spin or speed but it will look mostly the same. Loop kills and power loops should be separate specific swings. But you should always feel when doing your basic loop like you have the time to discuss politics or even converse with the mayor.
